sticky valve or

Dick,

The hesitation at 1100-1200 rpms in a C-85 is normal. I have it on mine (275
smh with 0-200 conversion stc) as do most of my Luscombe brethren with the
C-85.

I recently had an exhaust valve to stick in flight. It was interesting to
say the least, and in reaction to that experience I would like to pursue a
glider rating ;-).

My valve in my 275 hour ECI cylinder was stuck but good. My engine guy
reamed it out a little as he thought the clearance was a little tight. MMO
is now part of my regular maintenance routine.


Deb

--
1946 Luscombe 8A (His)
1948 Luscombe 8E (Hers)
1954 Cessna 195B, restoring (Ours)
Jasper, Ga. (JZP)

"Dick" wrote in message
...
Old WW2 mechanic says he hears a sticky valve on my C-85 when I fire up
for first time in morning but can't describe the sound and says it lasts
only as long as a finger snap.

Wants me to add Marvel Mystery oil. I use Aeroshell 100 (50 weight) and
change it every 25 hours.

I can't detect any roughness upon initial start around 900-1000 rpm in
front of my hanger nor during the taxi a couple of minutes to a runup
spot. On throttling up to 1500 for the mag check, I notice a slight
hesitation around 11-1200 rpm that goes away quickly and thought was just
from the low speed taxi.

Since I had to put a rental down about 7 years ago for a valve problem
(per the FBO), there is a little "pucker" factor regarding this
conversation G.

Light Plane Maintenance book references "hand proping before first start
of day to find 'flat' cylinder". Not sure I can identify a rapid falloff
in turning resistance (books definition).

Concern doesn't seem to get to the point where the "cold cylinder" test is
applicable as doesn't last long (his finger snap).

Am I chasing nothing or what is a valid approach?

Thanks, Dick